EP3134940B1 - Switchable pi shape antenna - Google Patents

Switchable pi shape antenna Download PDF

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Publication number
EP3134940B1
EP3134940B1 EP15789084.9A EP15789084A EP3134940B1 EP 3134940 B1 EP3134940 B1 EP 3134940B1 EP 15789084 A EP15789084 A EP 15789084A EP 3134940 B1 EP3134940 B1 EP 3134940B1
Authority
EP
European Patent Office
Prior art keywords
connector
mobile device
antenna
bands
electronics
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15789084.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3134940A1 (en
EP3134940A4 (en
Inventor
Hongwei Liu
Ning Ma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of EP3134940A1 publication Critical patent/EP3134940A1/en
Publication of EP3134940A4 publication Critical patent/EP3134940A4/en
Application granted granted Critical
Publication of EP3134940B1 publication Critical patent/EP3134940B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/378—Combination of fed elements with parasitic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0278—Arrangements for impedance matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • This disclosure is directed to antennas, and more particularly to low profile antennas used in advanced mobile devices including smartphones to cover popular bands.
  • Wireless mobile devices including smartphones require low profile antennas to meet desired product form factors.
  • the available inner dimension (ID) of these devices is limited due to numerous factors, including other component layout design.
  • the conventional T-shape antenna is commonly used in smartphones, which T-shaped antenna is good to cover third generation (3G) bands without a USB connector presented in the device housing.
  • 3G third generation
  • 4G long term evolution
  • the more popular bands are 704-960MHz (LTE B17, B20, G850, G900) & 1710-2170MHz (DCS, PCS, AWS) to 2500-2690MHz (LTE B7).
  • the conventional T-shaped antenna is limited in band coverage and is not ideally suitable for these popular bands.
  • EP 2 405 534 discloses an adjustable antenna system coupled to a radio-frequency transceiver.
  • the antenna includes main resonation element arm 164, a feed path (158 and 108), a short circuit path (132A or 132B), a path formed by adjustable electrical component 120 (e.g., switch) and a path formed by element 122 (e.g., a semicontinously or continuously adjustable component).
  • the antenna is an inverted-F antenna.
  • EP 2 677 600 and EP 2 562 867 describe antenna devices of mobile terminals.
  • a mobile device operable over a plurality of bands using an antenna, a connector configured to create a resonance, and having a passive or switchable impedance matching network.
  • the mobile device comprises electronics configured to operate the mobile device over multiple radio frequency, RF, bands, a Pi-shaped antenna (12) consisting of a radiating stripline, a first arm and a second arm formed in a shape of greek symbol Pi, the first arm and the second arm separately corresponding to two legs of the shape of the greek symbol Pi, the first arm including a coupling component (S1) of the Pi-shaped antenna, wherein the coupling component (S1) is capacitively coupled to a connector (30) of the mobile device (10) to provide a first resonance over a first band of the multiple RF bands, and wherein the second arm is coupled to the electronics via an impedance matching network (14) to provide one or more second resonances over the multiple RF bands.
  • a Pi-shaped antenna (12) consisting of a radiating stripline, a first arm and a second arm formed in a shape of greek symbol Pi, the first arm and the second arm separately corresponding to two legs of the shape of the greek symbol Pi
  • the first arm including a coupling component (
  • the impedance matching network is switchable by the electronics and configured to match an impedance of the electronics in at least two states, over multiple RF bands.
  • the impedance matching network comprises a switch, capacitors and inductors.
  • the Pi-shaped antenna is disposed along a distal edge of the mobile device.
  • the connector is one of a USB connector, an earphone connector, a microphone connector and a memory slot connector.
  • the electronics may comprise an RF driver configured to operate in long term evolution (LTE) band B17, B20 and B7, wherein the antenna and the connector create the resonance at band B7.
  • LTE long term evolution
  • the connector has a shell, wherein the coupling is coupled to the shell.
  • This disclosure provides a mobile device including a low profile Pi-shaped antenna including a switchable design configured to cover multiple popular 4G LTE bands from B17 to B7, as well as a high band B41.
  • a Pi-shaped antenna is defined as antenna having at least two arms each coupled to a radiating member and together forming the shape of the greek symbol Pi.
  • a mobile device 10 including a switchable Pi-shaped antenna 12 having three arms, IL1, IL2 and coupling S1.
  • Coupling S1 in combination with another component, such as a connector as will be described hereafter, is advantageously configured to provide a resonance to create a high band of the Pi-shaped antenna 12, thus extending the bandwidth of the antenna on the mobile device 10.
  • an impedance matching network 14 is configured to impedance match the antenna 12 to a radio frequency (RF) drive circuit 16 forming part of the device electronics 18.
  • Impedance matching network 14 may be passive or active as will be decribed below.
  • Bands LTE B17, B20, G850, G900 are 704-960MHz)
  • band LTE B7 is 1710-2170 MHz (DCS, PCS, AWS) to 2500-2690MHz.
  • Electronics 18 form part of a printed circuit board (PCB) 20 and are configured to operate the mobile device 10 in the above mentioned bands.
  • Electronics 18 may include a processor, memory, input/output circuits, a display, wireless transceivers and a battery, as are conventional in mobile devices, including smartphones, tablets and so forth.
  • the electronics 18 of mobile device 10 is operable to place and receive voice calls, text message, images, video files, game files, and other wireless communication signals, such as a mobile phone.
  • a PCB ground is shown at 22, and may form an RF ground and backplane for antenna 12.
  • Coupling S1 couples the drive circuit 16 of electronics 18 to feedline 26 of antenna 12.
  • Coupling S1 also is coupled to a device connector 30, with coupling S1 comprising a capacitive coupling.
  • the impedance matching network 14 is controlled by electronics circuit 18 and enables the antenna 12 to be selectively switched between two states to effectivley cover multiple bands, including the popular 4G LTE bands from lowschulds B17, B20 to high bands B7, and B41 if desired.
  • FIGURE 2 illustrates a schematic of the impedance matching network 14 forming a passive impedance matching network.
  • the impedance matching network 14 comprises inductor L1, capacitor C1, C/L components, and inductor L2, where inductor L2 is used for matching the impedance of the antenna 12 for both the low and the high bands.
  • impedance matching network 14 is configured to impedance match the driver circuit 16 to antenna 12 over the frequency range from low bands band B17 and B20 to high band B7 and B41.
  • the antenna 12 is a stripline antenna and is also tuned by the coupling S1, and the dimensions of the components of impedance matching network 14, specifically the length of inductors L1 and L2, and the IL2/coupling of coupling S1.
  • dimension D is 8 mm
  • the length of IL1 is 22 mm
  • the length of IL2 is 30mm, depending on the PCB dimensions.
  • Inductor L1 may have a value of 2 nH
  • capacitor C1 may have a value of 1.5pF
  • L2 may have a value of 4.7 nH.
  • the feedpoint 19 is off the center of the PCB 10 mm.
  • Antenna arms IL1 and IL2 are straight and thick to improve the low band.
  • Coupling S1 couples the drive circuitry 16 of the PCB 20 to the antenna radiators with USB to create the high band.
  • the values and dimensions of these components may be different and limitation to these values and dimensions is not to be inferred.
  • FIGURE 3 illustrates a perspective view of one embodiment of device 10 including the antenna 12 with the passive matching network 14 layed out over a backplane 22 at one end of the printed circuit board (PCB) 20.
  • the PCB 20 includes electronics 18 of the device 10, driving a first feedline 26 and a second switchable feedline 28 comprising the Pi-shaped antenna 12.
  • FIGURE 4 illustrates device 10 having the Pi-shaped antenna 12 formed at the distal end of the device 10, and proximate connector 30 which is coupled to electronics 18.
  • the connector 30 may comprise a USB connector positioned in the center of the device, as shown.
  • the coupling S1 forming the first arm of the antenna 12 is coupled to the shell of the connector 30 and the ground 22 to create another resonance covering the high band B7, thus expanding the bandwidth of the antenna 12.
  • the coupling S1 can also be coupled to other device connectors 30, such as a speaker/earphone connector, a microphone connector, a memory slot connector, a receiver, a metal cover of the device, or any other components, or any other kinds of ground on the PCB board (at center or in corner) to create one more high band resonance, such as at 2.6GHz to cover band B7.
  • This is a new way to use the environment to improve antenna bandwidth for a portable mobile communication device.
  • FIGURE 5 illustrtes a typical return loss for the antenna 12 having the passive impedance matching network 14 from band B20 to band B7.
  • FIGURE 6 illustrates impedance matching network 14 configured as a switchable impedance matching network.
  • Impedance matching network 14 is configured to have two (2) states to more effectively tune the antenna 12 for two bands, such as a low band in a first state, such as B17 and B20, and a high band in a second state, such as B7.
  • the impedance matching network 14 includes a switch SW1 controlled by driver 18 and configured to selectively configure the various components L1, L2, C1 and C2 in the first state and the second state.
  • the switch SW1 may be a single pole four throw (SP4T), although other types of switches may be used and are within the scope of this disclosure.
  • SP4T single pole four throw
  • FIGURE 7 illustates a return loss for the antenna 12 in the two different states, for state 1 and state 2.
  • State 1 provides a reduced return loss for band B17 as compared to state 2
  • state 2 provides a reduced return loss for bands B5 and B8 as compared to state 1.
  • the electronics 18 selectively establishes the 2 states of operating the antenna 12, and more than 2 states are possible and within the scope of the present disclosure.
  • FIGURE 8 illustrates the radiation efficiency of the antenna 12 in state 1 and state 2 for two bands, band B17 and band B7.
  • FIGURE 9 illustrates a second embodiment of a device 40 with the Pi-shaped antenna 12 removed and placed on the back of the device 40 for illustration.
  • the switchable impedance matching network 14 is shown in the left corner of device 40, and the USB connector is shown in the right corner.
  • the impedance matching network 14 can also include active components if desired.
  • active components can provide gain control and/or beam steering may be established.
  • the capacitively coupled Pi-shaped antenna with a switchable impedance matching network enables advanced mobile devices, such as those providing 4G, 5G and other versions, to provide coverage in desired bands using a low profile antenna.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Support Of Aerials (AREA)
  • Transceivers (AREA)
  • Telephone Set Structure (AREA)
  • Details Of Aerials (AREA)
EP15789084.9A 2014-05-09 2015-05-06 Switchable pi shape antenna Active EP3134940B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/274,474 US9184494B1 (en) 2014-05-09 2014-05-09 Switchable Pi shape antenna
PCT/CN2015/078380 WO2015169221A1 (en) 2014-05-09 2015-05-06 Switchable pi shape antenna

Publications (3)

Publication Number Publication Date
EP3134940A1 EP3134940A1 (en) 2017-03-01
EP3134940A4 EP3134940A4 (en) 2017-04-26
EP3134940B1 true EP3134940B1 (en) 2018-09-12

Family

ID=54363570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15789084.9A Active EP3134940B1 (en) 2014-05-09 2015-05-06 Switchable pi shape antenna

Country Status (9)

Country Link
US (2) US9184494B1 (pt)
EP (1) EP3134940B1 (pt)
JP (1) JP6351760B2 (pt)
KR (1) KR101870556B1 (pt)
CN (1) CN106663858B (pt)
BR (1) BR112016026227B1 (pt)
CA (1) CA2948417C (pt)
RU (1) RU2646945C1 (pt)
WO (1) WO2015169221A1 (pt)

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Also Published As

Publication number Publication date
CN106663858B (zh) 2019-04-12
WO2015169221A1 (en) 2015-11-12
US20150372384A1 (en) 2015-12-24
BR112016026227B1 (pt) 2022-08-30
JP2017522759A (ja) 2017-08-10
CA2948417A1 (en) 2015-11-12
KR20160149305A (ko) 2016-12-27
JP6351760B2 (ja) 2018-07-04
BR112016026227A2 (pt) 2017-08-15
US9184494B1 (en) 2015-11-10
RU2646945C1 (ru) 2018-03-12
EP3134940A1 (en) 2017-03-01
US9774083B2 (en) 2017-09-26
EP3134940A4 (en) 2017-04-26
CN106663858A (zh) 2017-05-10
CA2948417C (en) 2020-01-21
KR101870556B1 (ko) 2018-06-22

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